I tested on the site on Mac Safari 9.1. I didn’t see the Javascript error.

The fadein function doesn’t work. Please try to fix it:
1. remove line 518-532 of /js/custom.theme.js:

jQuery('#header_wrap').animate({opacity: 1}, 800, function(){
	
		jQuery('#main').imagesLoaded(function(){
			jQuery('#main').animate({opacity: 1}, 800);
		});
		
		if(jQuery('#sidebar').length){
			jQuery('#sidebar').imagesLoaded(function(){
				jQuery('#sidebar').animate({opacity: 1}, 800);
			});
		}
	
		jQuery('#footer_wrap').animate({opacity: 1}, 800);
		
	});

2. Please login wp-admin, go to Bee / General Settings / Custom Css
Paste the style code to Custom Css:
#header_wrap, #footer_wrap, #main, #sidebar {opacity: 1;}